.o_tree_editor {
    .o_tree_editor_node {
        .o_tree_editor_node_control_panel > button {
            opacity: .2;
        }

        &.o_hovered_button {
            .o_tree_editor_node_control_panel > button {
                opacity: .5;

                &:hover {
                    opacity: 1;
                }
            }
        }
    }
}
